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extern crate rmp_serde as rmps;
use rmps::{Deserializer, Serializer};
use serde::{Deserialize, Serialize};
use std::io::Cursor;
#[cfg(feature = "guest")]
extern crate wapc_guest as guest;
#[cfg(feature = "guest")]
use guest::prelude::*;
#[cfg(feature = "guest")]
pub struct Host {
binding: String,
}
#[cfg(feature = "guest")]
impl Default for Host {
fn default() -> Self {
Host {
binding: "default".to_string(),
}
}
}
#[cfg(feature = "guest")]
pub fn host(binding: &str) -> Host {
Host {
binding: binding.to_string(),
}
}
#[cfg(feature = "guest")]
pub fn default() -> Host {
Host::default()
}
#[cfg(feature = "guest")]
impl Host {
pub fn write_event(
&self,
stream_id: String,
values: std::collections::HashMap<String, String>,
) -> HandlerResult<EventAck> {
let input_args = WriteEventArgs { stream_id, values };
host_call(
&self.binding,
"wasmcloud:eventstreams",
"WriteEvent",
&serialize(input_args)?,
)
.map(|vec| {
let resp = deserialize::<EventAck>(vec.as_ref()).unwrap();
resp
})
.map_err(|e| e.into())
}
pub fn query_stream(&self, query: StreamQuery) -> HandlerResult<EventList> {
host_call(
&self.binding,
"wasmcloud:eventstreams",
"QueryStream",
&serialize(query)?,
)
.map(|vec| {
let resp = deserialize::<EventList>(vec.as_ref()).unwrap();
resp
})
.map_err(|e| e.into())
}
}
#[cfg(feature = "guest")]
pub struct Handlers {}
#[cfg(feature = "guest")]
impl Handlers {
pub fn register_deliver_event(f: fn(Event) -> HandlerResult<EventAck>) {
*DELIVER_EVENT.write().unwrap() = Some(f);
register_function(&"DeliverEvent", deliver_event_wrapper);
}
}
#[cfg(feature = "guest")]
lazy_static::lazy_static! {
static ref DELIVER_EVENT: std::sync::RwLock<Option<fn(Event) -> HandlerResult<EventAck>>> = std::sync::RwLock::new(None);
}
#[cfg(feature = "guest")]
fn deliver_event_wrapper(input_payload: &[u8]) -> CallResult {
let input = deserialize::<Event>(input_payload)?;
let lock = DELIVER_EVENT.read().unwrap().unwrap();
let result = lock(input)?;
Ok(serialize(result)?)
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct WriteEventArgs {
#[serde(rename = "streamId")]
pub stream_id: String,
#[serde(rename = "values")]
pub values: std::collections::HashMap<String, String>,
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct Event {
#[serde(rename = "eventId")]
pub event_id: String,
#[serde(rename = "streamId")]
pub stream_id: String,
#[serde(rename = "values")]
pub values: std::collections::HashMap<String, String>,
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct EventAck {
#[serde(rename = "eventId")]
pub event_id: Option<String>,
#[serde(rename = "error")]
pub error: Option<String>,
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct EventList {
#[serde(rename = "events")]
pub events: Vec<Event>,
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct StreamQuery {
#[serde(rename = "streamId")]
pub stream_id: String,
#[serde(rename = "range")]
pub range: Option<TimeRange>,
#[serde(rename = "count")]
pub count: u64,
}
#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct TimeRange {
#[serde(rename = "minTime")]
pub min_time: u64,
#[serde(rename = "maxTime")]
pub max_time: u64,
}
pub fn serialize<T>(
item: T,
) -> ::std::result::Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>>
where
T: Serialize,
{
let mut buf = Vec::new();
item.serialize(&mut Serializer::new(&mut buf).with_struct_map())?;
Ok(buf)
}
pub fn deserialize<'de, T: Deserialize<'de>>(
buf: &[u8],
) -> ::std::result::Result<T, Box<dyn std::error::Error + Send + Sync>> {
let mut de = Deserializer::new(Cursor::new(buf));
match Deserialize::deserialize(&mut de) {
Ok(t) => Ok(t),
Err(e) => Err(format!("Failed to de-serialize: {}", e).into()),
}
}